The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 30, 1978
Filed:
Nov. 07, 1977
William Percy Moore, Hopewell, VA (US);
Waverly Chemical Co., Hopewell, VA (US);
Abstract
Method of producing a substantially chemically stable urea-formaldehyde foam which comprises preparing a partially cured aqueous urea-formaldehyde resin, modifying the partially cured resin by reacting at pH 4.5 - 5.5 and 70.degree.-110.degree. C with aqueous dialdehyde containing two to six molecular carbons and additional urea with each additive amounting to 1-5 per cent by weight of the modified resin, neutralizing the modified resin to pH 6.7 - 7.5 by addition of aqueous alkali hydroxides or carbonates, combining said neutral modified resin with a froth produced by forcing air through a dilute acidic aqueous surfactant solution to re-activate and complete the cure of the modified resin in the foam, and drying the foam. Glyoxal is the preferred dialdehyde for modifying the urea-formaldehyde foam resin because of its effectiveness at increasing chemical stability of the foam at levels as low as 1.0 per cent.